74680561 has 2 divisors, whose sum is σ = 74680562. Its totient is φ = 74680560.

The previous prime is 74680559. The next prime is 74680579. The reversal of 74680561 is 16508647.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 37896336 + 36784225 = 6156^2 + 6065^2 .

It is a cyclic number.

It is not a de Polignac number, because 74680561 - 2¹ = 74680559 is a prime.

Together with 74680559, it forms a pair of twin primes.

It is equal to p_4376647 and since 74680561 and 4376647 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 74680561.

It is not a weakly prime, because it can be changed into another prime (74620561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37340280 + 37340281.

It is an arithmetic number, because the mean of its divisors is an integer number (37340281).

Almost surely, 2^74680561 is an apocalyptic number.

It is an amenable number.

74680561 is a deficient number, since it is larger than the sum of its proper divisors (1).

74680561 is an equidigital number, since it uses as much as digits as its factorization.

74680561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 40320, while the sum is 37.

The square root of 74680561 is about 8641.7915387956. The cubic root of 74680561 is about 421.1167577493.

The spelling of 74680561 in words is "seventy-four million, six hundred eighty thousand, five hundred sixty-one".